HWPOISON: Copy si_addr_lsb to user

The original hwpoison code added a new siginfo field si_addr_lsb to
pass the granuality of the fault address to user space. Unfortunately
this field was never copied to user space. Fix this here.

I added explicit checks for the MCEERR codes to avoid having
to patch all potential callers to initialize the field.

Signed-off-by: Andi Kleen <ak@linux.intel.com>

diff --git a/kernel/signal.c b/kernel/signal.c
index bded65187780f5f288bd779920a5c04c190528dc..919562c3d6b720d58ff246b2c412114d77c0b419 100644 (file)
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -2214,6 +2214,14 @@ int copy_siginfo_to_user(siginfo_t __user *to, siginfo_t *from)
                err |= __put_user(from->si_addr, &to->si_addr);
 #ifdef __ARCH_SI_TRAPNO
                err |= __put_user(from->si_trapno, &to->si_trapno);
+#endif
+#ifdef BUS_MCEERR_AO
+               /* 
+                * Other callers might not initialize the si_lsb field,
+                * so check explicitely for the right codes here.
+                */
+               if (from->si_code == BUS_MCEERR_AR || from->si_code == BUS_MCEERR_AO)
+                       err |= __put_user(from->si_addr_lsb, &to->si_addr_lsb);
 #endif
                break;
        case __SI_CHLD: